diff --git a/common.mk b/common.mk
index 7f790969fb..99d1bb198c 100644
--- a/common.mk
+++ b/common.mk
@@ -35,12 +35,11 @@ DOCLIE_GIT_REF = v1.1.5
 
 STATIC_RUBY   = static-ruby
 
-TIMESTAMPDIR  = $(EXTOUT)/.timestamp
 EXTCONF       = extconf.rb
 LIBRUBY_EXTS  = ./.libruby-with-ext.time
 REVISION_H    = ./.revision.time
-PLATFORM_D    = $(TIMESTAMPDIR)/.$(PLATFORM_DIR).time
-ENC_TRANS_D   = $(TIMESTAMPDIR)/.enc-trans.time
+PLATFORM_D    = ./$(PLATFORM_DIR)/.time
+ENC_TRANS_D   = ./enc/trans/.time
 RDOCOUT       = $(EXTOUT)/rdoc
 HTMLOUT       = $(EXTOUT)/html
 CAPIOUT       = doc/capi
diff --git a/enc/Makefile.in b/enc/Makefile.in
index 8385236494..73b1e70941 100644
--- a/enc/Makefile.in
+++ b/enc/Makefile.in
@@ -20,9 +20,8 @@ TRANSSODIR = $(ENCSODIR)/trans
 DLEXT = @DLEXT@
 OBJEXT = @OBJEXT@
 LIBEXT = @LIBEXT@
-TIMESTAMPDIR  = $(EXTOUT)/.timestamp
-ENC_TRANS_D   = $(TIMESTAMPDIR)/.enc-trans.time
-ENC_TRANS_SO_D = $(TIMESTAMPDIR)/.enc-trans.so.time
+ENC_TRANS_D   = ./enc/trans/.time
+ENC_TRANS_SO_D = ./enc/trans/.so.time
 
 BUILTIN_ENCS	= enc/ascii.c enc/us_ascii.c\
 		  enc/unicode.c enc/utf_8.c